Beryl Field : Current Challenges
• Mature field looking to extend life • A number of accumulations exist about 25.000ft (7. • ExxonMobil considering extending platform drilling reach from 15. • World‐wide interest interest in this option
Ref: Cutt.00ft to 25. 2007
.000 as a viable way of accessing satellite reserves.5km) from platform. • Current high cost of semi‐sub rig rates makes subsea tie‐back expensive.

2006. p5
.Flow Assurance Challenges
• You may question the need for offshore platforms? • Why not transport the reservoir fluids in pipelines all the way back to shore? • Flow assurance problems caused by ‘three three phase flow’ and pressure/ temperature reductions restricts the length by which reservoir fluids can be transported by subsea pipeline
Ref: Topic 19.

Transportation of Processed Fluids
• Pipeline can be used for oil and gas • Tanker can be used for oil if pipeline uneconomic • Offshore gas is ‘stranded’ if a pipeline or other means are uneconomic i (for (f example l compressed gas carrier)
Ref: Topic 19.2006. p7
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CNS is a good example of a new innovative alternative to a subsea tie‐back
.Alternatives to Subsea Tie‐back
• Extended reach drilling (ERD) is a possible alternative to subsea tie‐back • Main restriction on ERD is distance < 10‐ 11km • Venture Production’s Chestnut Field.

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Timely satellite field development required for sustainable North Sea Oil & Gas Industry
Regions R i of f CNS and d NNS within ithi 30k 30km of f fi fields ld currently tl under production taking into account expected cessation of production
(Ref: Jayasekera. 2002)
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